argument not modified when passed by reference to a mocked method in an overloaded class

$phpLDAPMock = Mockery::mock('overload:\Ltb\PhpLDAP');

        $phpLDAPMock->shouldreceive('ldap_parse_result')
                    ->with("ldap_connection", "ldap_search_result1", null, null, null, null,
                           \Mockery::on(function(&$control) use(&$returnedcontrol1, &$returnedcontrol2, &$control1, &$control2){
                               $cookie = $control[0]['value']['cookie'];
                               switch ($cookie) {
                                   case $control1[0]['value']['cookie']:
                                       $control = $returnedcontrol1;
                                       // Here, $control contains the correct value,
                                       // but back in the ldap_parse_result function, the value is unchanged
                                       return true;
                                   case $control2[0]['value']['cookie']:
                                       $control = $returnedcontrol2;
                                       return true;
                                   default:
                                       return false;
                               }
                           })
                    );